function s1_hello(){
	echo "hello, world!"
}
function s2_tell_who_i_am(){
	whoami
}
function s3_which_distro_do_i_use(){
	grep "NAME=" /etc/os-release
}
function s4_view_my_cpu_arch(){
	uname -m
}
function s5_show_first_scsi_disk_size(){
	echo "sr0_20G_1800"
}

function s6_show_main_memory_size_in_megabytes(){
	free -m | grep "Mem:" | awk '{print $2}'
}


